Mineral oils: processes and products – Chemical conversion of hydrocarbons – Plural serial stages of chemical conversion
Patent
1976-06-18
1977-03-08
Levine, Herbert
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Plural serial stages of chemical conversion
208 18, 208 80, 208 86, 208 93, C10G 1300, C10G 3702
Patent
active
040111547
ABSTRACT:
A process is disclosed for producing a lubricating oil base stock by: (1) fractionating a hydrocarbon feedstock boiling above 650.degree. F into a plurality of fractions including at least a lower-boiling fraction and a higher-boiling fraction; (2) contacting the lower-boiling fraction and hydrogen in a first hydrocracking zone, at hydrocracking conditions, with a hydrocracking catalyst to obtain an effluent comprising hydrocarbons boiling in the range of the feedstock and hydrocarbons boiling below the boiling range of the feedstock; (3) contacting at least the hydrocarbons boiling in the range of said feedstock formed in step (2), the higher-boiling fraction from step (1) without substantial intermediate deasphalting thereof, and hydrogen in a second hydrocracking zone, at hydrocracking conditions, with a hydrocracking catalyst to obtain a lubricating oil base stock including a plurality of lube oil fractions of reduced viscosity index spread over the range of the lube oil fractions; and recovering the lube oil base stock. Preferably, the resulting lube oil base stocks have a viscosity index spread of not more than about 15 units, preferably not more than 10, over the lube oil base stock viscosity range of light neutrals to bright stocks.
REFERENCES:
patent: 3579435 (1971-05-01), Olenzak et al.
Mason Harold F.
Stangeland Bruce E.
Chevron Research Company
Davies R. H.
Levine Herbert
Magdeburger G. F.
Reese W. D.
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